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Chip-Level HARQ Chase Combining for HSUPA

2009; Hindawi Publishing Corporation; Volume: 2009; Issue: 1 Linguagem: Inglês

10.1155/2009/230276

2090-0155

Mohamed Et‐tolba, Samir Saoudi, Raphaël Visoz, Tarik Ait-Idir,

Satellite Communication Systems

Hybrid automatic repeat request (HARQ) is used in high‐speed uplink packet access (HSUPA) to increase the data rate. Chase combining is the simplest of HARQ algorithms. It provides a time diversity and requires a small memory. In this paper, we propose a technique to increase the chase combining efficiency. In this method, HARQ transmissions are seen as additional receive antennas which are jointly combined at chip‐level using a space‐time linear minimum square error (LMMSE). We demonstrate that the chase combining diversity gain is considerably increased especially for high‐order modulation.